Here we look at the historical performance of selected wind farms. Use the controls on the right to select a wind farm, then decide whether to look at daily or monthly performance. There is also an option to show an indicator of overall trend.
Daily or monthly
The horizontal green line shows the load factor that the National Grid currently uses in its outlook for future generation for this wind farm.
The dotted red line shows the "line of best fit" to recent performance. This is calculated using standard linear regression.
This forecasts the load factor after 25 years to be:
The data we use for these charts are the official generation data from the Elexon website. We also check Trading Data from the same site and cross-check with data on Renewable Obligations from the Ofgem website.
We always show data in complete years to avoid seaonal bias. We usually aim to summarize on the basis of the most recent 5 years of data at least (subject to availability).
We do not necessarily make all older data available, as our emphasis is on recent and current trends and on supporing forecasting.